2007 INFINITI QX56 Factory Service Manual

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Page 1113 of 3061

INFINITI QX56 2007 Factory Service Manual EC-30
< SERVICE INFORMATION >
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System DescriptionINFOID:0000000003531591
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to

EC-30
< SERVICE INFORMATION >
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System DescriptionINFOID:0000000003531591
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line
BASIC ASCD SYSTEM
Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE indicator and SET indicator in combination meter. If any
malfunction occurs in ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
SET OPERATION
Press MAIN switch. (The CRUISE indicator in combination meter illuminates.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch. (Then SET indicator in combination meter illuminates.)
ACCELERATE OPERATION
If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will keep the new set speed.
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
• Brake pedal is depressed
• Selector lever is changed to N, P, R position
• Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
• VDC system is operated
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicator lamp.
• Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.
• Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.
If MAIN switch is turned to OFF during ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.
COAST OPERATION
When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will keep the new set speed.
RESUME OPERATION
Sensor Input signal to ECM ECM function Actuator
ASCD brake switch Brake pedal operation
ASCD vehicle speed controlElectric throttle control
actuator Stop lamp switch Brake pedal operation
ASCD steering switch ASCD steering switch operation
Park/neutral position (PNP) switch Gear position
Wheel sensor Vehicle speed*
TCM Powertrain revolution*

Page 1114 of 3061

INFINITI QX56 2007 Factory Service Manual AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-31
< SERVICE INFORMATION >
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When the RESUME/ACCELERATE switch is pressed after cancel operation other than pressing MAIN switch

Page 1115 of 3061

INFINITI QX56 2007 Factory Service Manual EC-32
< SERVICE INFORMATION >
CAN COMMUNICATION
CAN COMMUNICATION
System DescriptionINFOID:0000000003531593
CAN (Controller Area Network) is a serial communication line for real time application. It i

Page 1116 of 3061

INFINITI QX56 2007 Factory Service Manual EVAPORATIVE EMISSION SYSTEM
EC-33
< SERVICE INFORMATION >
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EVAPORATIVE EMISSION SYSTEM
DescriptionINFOID:0000000003531594
SYSTEM DESCRIPTION
The evaporative emission sys

Page 1117 of 3061

INFINITI QX56 2007 Factory Service Manual EC-34
< SERVICE INFORMATION >
EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION LINE DRAWING
PBIB2053E

Page 1118 of 3061

INFINITI QX56 2007 Factory Service Manual EVAPORATIVE EMISSION SYSTEM
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< SERVICE INFORMATION >
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Component InspectionINFOID:0000000003531595
EVAP CANISTER
BBIA0444E

Page 1119 of 3061

INFINITI QX56 2007 Factory Service Manual EC-36
< SERVICE INFORMATION >
EVAPORATIVE EMISSION SYSTEM
Check EVAP canister as follows:
1. Block port B.
2. Blow air into port Aand check that it flows freely out of port C.
3. Release blocked port

Page 1120 of 3061

INFINITI QX56 2007 Factory Service Manual EVAPORATIVE EMISSION SYSTEM
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< SERVICE INFORMATION >
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Positive pressure is delivered to the EVAP system through the EVAP
service port. If fuel vapor leakage in the

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